From patchwork Fri Jun 26 22:38:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tyler Hicks X-Patchwork-Id: 11629057 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D327A161F for ; Fri, 26 Jun 2020 22:39:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B10D120B1F for ; Fri, 26 Jun 2020 22:39:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="WekBJFwM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726546AbgFZWjs (ORCPT ); Fri, 26 Jun 2020 18:39:48 -0400 Received: from linux.microsoft.com ([13.77.154.182]:37936 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726528AbgFZWjn (ORCPT ); Fri, 26 Jun 2020 18:39:43 -0400 Received: from sequoia.work.tihix.com (162-237-133-238.lightspeed.rcsntx.sbcglobal.net [162.237.133.238]) by linux.microsoft.com (Postfix) with ESMTPSA id EE15120B4908; Fri, 26 Jun 2020 15:39:41 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com EE15120B4908 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1593211182; bh=lDUDSl/J2tMl17zuExKPD6HFUxjBs8GdZNpGG6MWTno=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WekBJFwMheMIKbdKrLA71n4R1zeKG7X4smVnVlKG7hugGkAPMsp8x8Ew7R1+YEfac 63BP0tUtg5iBBMqkjWqBBBtXu5RJjVQJLNHrPtlTTdNmJC3eC2k7CtWCYn3369FAWd SWaRS1p+xRshAazJYS0IAn2o+W1bWmHQSeJT6eM0= From: Tyler Hicks To: Mimi Zohar , Dmitry Kasatkin Cc: James Morris , "Serge E . Hallyn" , Lakshmi Ramasubramanian , Prakhar Srivastava , linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v2 09/11] ima: Move validation of the keyrings conditional into ima_validate_rule() Date: Fri, 26 Jun 2020 17:38:58 -0500 Message-Id: <20200626223900.253615-10-tyhicks@linux.microsoft.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200626223900.253615-1-tyhicks@linux.microsoft.com> References: <20200626223900.253615-1-tyhicks@linux.microsoft.com> MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: Use ima_validate_rule() to ensure that the combination of a hook function and the keyrings conditional is valid and that the keyrings conditional is not specified without an explicit KEY_CHECK func conditional. This is a code cleanup and has no user-facing change. Signed-off-by: Tyler Hicks --- * v2 - Allowed IMA_DIGSIG_REQUIRED, IMA_PERMIT_DIRECTIO, IMA_MODSIG_ALLOWED, and IMA_CHECK_BLACKLIST conditionals to be present in the rule entry flags for non-buffer hook functions. security/integrity/ima/ima_policy.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 8cdca2399d59..43d49ad958fb 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -1000,6 +1000,15 @@ static bool ima_validate_rule(struct ima_rule_entry *entry) case KEXEC_KERNEL_CHECK: case KEXEC_INITRAMFS_CHECK: case POLICY_CHECK: + if (entry->flags & ~(IMA_FUNC | IMA_MASK | IMA_FSMAGIC | + IMA_UID | IMA_FOWNER | IMA_FSUUID | + IMA_INMASK | IMA_EUID | IMA_PCR | + IMA_FSNAME | IMA_DIGSIG_REQUIRED | + IMA_PERMIT_DIRECTIO | + IMA_MODSIG_ALLOWED | + IMA_CHECK_BLACKLIST)) + return false; + break; case KEXEC_CMDLINE: if (entry->action & ~(MEASURE | DONT_MEASURE)) @@ -1027,7 +1036,8 @@ static bool ima_validate_rule(struct ima_rule_entry *entry) default: return false; } - } + } else if (entry->flags & IMA_KEYRINGS) + return false; return true; } @@ -1209,7 +1219,6 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) keyrings_len = strlen(args[0].from) + 1; if ((entry->keyrings) || - (entry->func != KEY_CHECK) || (keyrings_len < 2)) { result = -EINVAL; break;